Which albums turned you off from bands completely even if previous material was good?

[Eddie's Uncle]

Manowar - Warriors of the World
Metallica - Load (Black Album was already bad, but not enough to completely alienate me)
Queensryche - Y2K
Deicide - Til Death Do Us Part (they won me back with In the Minds of Evil, though)
Cannibal Corpse - Gore Obsessed
Satyricon - Rebel Extravaganza
Anathema - Fine Day To Exit
Moonspell - Sin/Pecado
Paradise Lost - One Second
Sepultura - Roots
Dark Funeral - Attera Totus Sanctum
Dimmu Borgir - Spiritual Black Dimension
Blind Guardian - A Night At The Opera
Samael - Exodus
Iced Earth - Horror Show
Kreator - Outcast
Theatre of Tragedy - Aegis
Dark Tranquillity - Projector
In Flames - Whoracle
Emperor - IX Equilibrium
Finntroll - Nattfödd
Cancer - Black Faith
Nuclear Assault - Third World Genocide

Pretty much any album where the band desperately tried to jump on a trend.

 

[Maturin]

I was a big fan of Europe. Both the 80's band that dropped "The Final Countdown", especially Out of this World (1988) and the reunited and modern sounding band that did superb records like Start from the Dark (2004) and Secret Society (2006). The latter which I consider their best album.

In 2012 Kevin Shirley produced Bag of Bones for them, which sounds more classic rock. Still a good record, but after this they've gone towards this style entirely and become sort of Deep Purple from Wish. I'm no longer a fan and won't care what they do. It's just boring, this material.

 

[Magnus]

Manowar - Warriors of the World
Metallica - Load (Black Album was already bad, but not enough to completely alienate me)
Queensryche - Y2K
Deicide - Til Death Do Us Part (they won me back with In the Minds of Evil, though)
Cannibal Corpse - Gore Obsessed
Satyricon - Rebel Extravaganza
Anathema - Fine Day To Exit
Moonspell - Sin/Pecado
Paradise Lost - One Second
Sepultura - Roots
Dark Funeral - Attera Totus Sanctum
Dimmu Borgir - Spiritual Black Dimension
Blind Guardian - A Night At The Opera
Samael - Exodus
Iced Earth - Horror Show
Kreator - Outcast
Theatre of Tragedy - Aegis
Dark Tranquillity - Projector
In Flames - Whoracle
Emperor - IX Equilibrium
Finntroll - Nattfödd
Cancer - Black Faith
Nuclear Assault - Third World Genocide

Pretty much any album where the band desperately tried to jump on a trend.

Rebel Extravaganza is quite good actually I think. But it does take some time, and realising it's something entirely different from the previous three. Plus you have Snorre's contributions.
I think I lost them on the next though, Volcano.